Salvage-free cementing tool

The utility model discloses a salvage-free cementing tool. The salvage-free cementing tool comprises a combined sleeve assembly and a supporting cylinder which are embedded in a cementing device body. The combined sleeve assembly comprises a core barrel and an outer barrel, the outer barrel is embedded and fixed in the cementing device body, the core barrel is embedded in the inner side of the outer barrel, a locking block is movably embedded in the outer barrel, and the locking block penetrates through the core barrel to fix the core barrel; the supporting cylinder is embedded into the inner side of the core cylinder and fixed to the core cylinder through a pin, and the bottom of the peripheral side of the supporting cylinder abuts against the locking block. The closing plug pushes the supporting cylinder to shear the pin and then move downwards, the downward movement of the supporting cylinder is matched with the driving of the unlocking piece to enable the locking block to fall into the adjusting groove of